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Technology introduction of spider silk to improve battery performance

Release time: 2015-05-27 10:30

Standard Group (Hong Kong) Co., Ltd. Industry Technology Information: Technology introduction of spider silk to improve battery performance. From mobile devices to lithium-ion batteries for electric vehicles, graphite is one of the key components. When the lithium-ion battery is charged, lithium ions diffuse from the positive electrode of the battery and adsorb on the graphite near the negative electrode, and lithium ions move from the graphite to the positive electrode again when discharged.

However, graphite is relatively unsuitable for storing lithium ions, so the capacity of lithium-ion batteries that rely on graphite is not too high. Now, scientists from Beijing Institute of Technology have discovered that using spider silk instead of graphite as a lithium ion storage medium can significantly improve battery performance.

Spider silk has been introduced into the design of electronic equipment by scientists for its strength and toughness. For example, a carbon nanofiber covered with a spider silk coating is more conductive and has three times the strength of the latter.

In their research, they discovered that using a chemical treatment to treat natural spider silk can turn it into a porous nitrogen band of 15-30 nanometers thick, which can hold carbon. Nitrogen atoms with more electrons increase the conductivity of the material and provide additional space for lithium ions.

Using a one-step technique to incorporate this material into prototype batteries and supercapacitors, the conductivity will be scaled up.

For batteries, the new material can store about 5 times more lithium ions than graphite batteries. The new supercapacitors have also proven to be very stable (self-discharge is weaker). After repeating 10,000 charge and discharge cycles, the loss is only about 9%.

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